* [PATCH AUTOSEL 5.15 15/16] io_uring: perform poll removal even if async work removal is successful
[not found] <[email protected]>
@ 2022-01-23 0:12 ` Sasha Levin
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From: Sasha Levin @ 2022-01-23 0:12 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Jens Axboe, Florian Fischer, Sasha Levin, io-uring
From: Jens Axboe <[email protected]>
[ Upstream commit ccbf726171b7328f800bc98005132fd77eb1a175 ]
An active work can have poll armed, hence it's not enough to just do
the async work removal and return the value if it's different from "not
found". Rather than make poll removal special, just fall through to do
the remaining type lookups and removals.
Reported-by: Florian Fischer <[email protected]>
Link: https://lore.kernel.org/io-uring/20220118151337.fac6cthvbnu7icoc@pasture/
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
fs/io_uring.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0006fc7479ca3..dbdd8c77774c1 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6304,16 +6304,21 @@ static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr)
WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current);
ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx);
- if (ret != -ENOENT)
- return ret;
+ /*
+ * Fall-through even for -EALREADY, as we may have poll armed
+ * that need unarming.
+ */
+ if (!ret)
+ return 0;
spin_lock(&ctx->completion_lock);
+ ret = io_poll_cancel(ctx, sqe_addr, false);
+ if (ret != -ENOENT)
+ goto out;
+
spin_lock_irq(&ctx->timeout_lock);
ret = io_timeout_cancel(ctx, sqe_addr);
spin_unlock_irq(&ctx->timeout_lock);
- if (ret != -ENOENT)
- goto out;
- ret = io_poll_cancel(ctx, sqe_addr, false);
out:
spin_unlock(&ctx->completion_lock);
return ret;
--
2.34.1
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